Space qualification issues in acousto-optic tunable filter (AOTF)-based spectrometers

Trivedi, Sudhir; Rosemeier, Jolanta; Jin, Feng; Kutcher, Susan; Chen, Ruijin; Prasad, Narasimha S.

doi:10.1117/12.659746

Cited by 6 publications

(1 citation statement)

References 8 publications

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“…Hence, with broadband light as an input, orthogonally polarized, spectrally narrow beams are diffracted within the crystal and emerge at a small angle relative to the exit face of the crystal. The AOTF material, TeO 2 , is inherently radiation hard (Prasad et al., 2007 ; Trivedi et al., 2006 ). Furthermore, these devices have no moving parts, making them an attractive option for landed surface platforms.…”

Section: Instrument Descriptionsmentioning

confidence: 99%

The Development and Demonstration of the Portable Acousto‐Optic Spectrometer for Astrobiology in Cave Environments

Chanover

Uckert

Voelz

et al. 2023

Earth and Space Science

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The development of in situ instrumentation for the detection of biomarkers in planetary cave environments is critical for the search for evidence of present or past life in our solar system. As refugia from the harsh ionizing radiation environments on the surfaces of airless solar system bodies or those with thin atmospheres, planetary caves represent a tantalizing location in which to conduct searches for extraterrestrial life (Viúdez-Moreiras, 2021). There are myriad challenges associated with investigations of planetary subsurface environments. However, once subsurface access is achieved, the exploration of planetary caves will require robust technologies with low size, weight and power (SWaP) in order to overcome the operational limitations of a small platform.The detection of extant or extinct life in planetary subsurfaces requires the identification of potential biomarkers, or signatures of physical structure, chemical composition, or metabolic processes associated with living organisms (Uckert et al., 2017). Broadly speaking, a wide range of both passive and active in situ techniques have been developed for and employed in the characterization of planetary surface environments in an effort to identify potential biomarkers. These techniques include (but are not limited to) mass spectrometry (

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Section: Instrument Descriptionsmentioning

confidence: 99%

The Development and Demonstration of the Portable Acousto‐Optic Spectrometer for Astrobiology in Cave Environments

Chanover

Uckert

Voelz

et al. 2023

Earth and Space Science

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Growth and Temperature-Dependent Mechanical and Thermal Properties of One-Dimensional Chain Structure Hg₂Br₂ Crystals for Infrared Acousto-Optic Device Application

Lin

et al. 2021

Crystal Growth & Design

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The long-wave infrared acousto-optic tunable filters (AOTFs) based on Hg2Br2 crystals have attracted much interest in space exploration and harmful chemical agent detection. However, the growth of large Hg2Br2 single crystals with high quality and optical homogeneity still remains a challenge, and the lack of temperature-dependent mechanical and thermal properties of this crystal hinders the further enhancement of acousto-optic performance in practical applications. In this context, Hg2Br2 crystals (Φ 35 × 40 mm3) were successfully grown by the physical vapor transport (PVT) method. The optical homogeneity of the as-grown crystal is increased to 7.15 × 10–5 by restraining the impurities, striations, and cracks. In addition, the anisotropic mechanical and thermal properties varying with the temperature of Hg2Br2 crystals were systematically investigated. The compression modulus along the ⟨110⟩ orientation decreases from 17 to 7 GPa in the temperature range of −100 to 150 °C, while it ranges from 5.5 to 1.5 GPa along the ⟨001⟩ orientation. The thermal conductivities along ⟨110⟩ and ⟨001⟩ orientations vary in the range of 1.32–0.52 and 2.06–1.05 W/(m·K) with the increase in temperature from −140 to 100 °C, respectively, and then remain stable in the range of 100–150 °C. Using the first-principles calculation on the electron transfer characteristic between atoms and the bonding property within molecules of Hg2Br2 crystals, the large anisotropic mechanical and thermal properties could be explained, which are mainly attributed to the one-dimensional chain structure of the compound. Notably, the mechanical and thermal properties of Hg2Br2 crystals at low temperature are better than those at high temperature, which guarantees the practical application of AOTFs in a space extreme environment.

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Imaging spectrometer based on AOTF and its prospects in deep-space exploration application

Shu

Wang

2011

SPIE Proceedings

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The Acousto-Optical Tunable Filter (AOTF) is an electronically tunable optical filter based on Acousto-optic effect and has its own special compared with other dispersive parts. Because its characteristics of electronic tunable spectral selection, rapid response and simple structure, imaging spectrometer based on AOTF is a useful high-spectral technology, especially in deep space exploration applications. This paper introduces two imaging spectrometers, a VIS-NIR Imaging Spectrometer (VNIS) built as a payload instrument for lunar detection and a whiskbroom imaging spectrometer (WIS) with programmable spectral sampling. VNIS provides programmable spectral selection from 0.45 to 2.4 μm and includes two channels, a V-NIR hyper-spectral imager (0.45 to 0.95μm) and a SWIR spectrograph (0.9 to 2.4μm), with a spectral overlap of 0.05μm. WIS is a kind of scanning, spectral programmable imaging spectrometer, includes a scanning mechanism and a programmable spectral selection spectrometer. In the end, the prospects in deep-space exploration application are discussed.

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Space qualification issues in acousto-optic tunable filter (AOTF)-based spectrometers

Cited by 6 publications

References 8 publications

The Development and Demonstration of the Portable Acousto‐Optic Spectrometer for Astrobiology in Cave Environments

The Development and Demonstration of the Portable Acousto‐Optic Spectrometer for Astrobiology in Cave Environments

Growth and Temperature-Dependent Mechanical and Thermal Properties of One-Dimensional Chain Structure Hg₂Br₂ Crystals for Infrared Acousto-Optic Device Application

Imaging spectrometer based on AOTF and its prospects in deep-space exploration application

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Space qualification issues in acousto-optic tunable filter (AOTF)-based spectrometers

Cited by 6 publications

References 8 publications

The Development and Demonstration of the Portable Acousto‐Optic Spectrometer for Astrobiology in Cave Environments

The Development and Demonstration of the Portable Acousto‐Optic Spectrometer for Astrobiology in Cave Environments

Growth and Temperature-Dependent Mechanical and Thermal Properties of One-Dimensional Chain Structure Hg2Br2 Crystals for Infrared Acousto-Optic Device Application

Imaging spectrometer based on AOTF and its prospects in deep-space exploration application

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Growth and Temperature-Dependent Mechanical and Thermal Properties of One-Dimensional Chain Structure Hg₂Br₂ Crystals for Infrared Acousto-Optic Device Application